Enable checkstyle rule for JLS modifier order

JLS specifies a preferred order for modifiers in
declarations.  Enabled this rule and fixed the
problems that it encountered.

Change-Id: I5e8fa3d29f785ced4c61fbb8c7c8b168289f06e2
diff --git a/src/main/java/net/onrc/onos/core/util/PerformanceMonitor.java b/src/main/java/net/onrc/onos/core/util/PerformanceMonitor.java
index 2a85904..7fb0597 100644
--- a/src/main/java/net/onrc/onos/core/util/PerformanceMonitor.java
+++ b/src/main/java/net/onrc/onos/core/util/PerformanceMonitor.java
@@ -12,7 +12,7 @@
  * Class for collecting performance measurements
  */
 public class PerformanceMonitor {
-    private final static Logger log = LoggerFactory.getLogger(PerformanceMonitor.class);
+    private static final Logger log = LoggerFactory.getLogger(PerformanceMonitor.class);
 
     // experiment name -> PerformanceMonitor
     private static final ConcurrentHashMap<String, PerformanceMonitor> PERF_MONS = new ConcurrentHashMap<>();
@@ -33,7 +33,7 @@
     private final ConcurrentHashMap<String, Queue<Measurement>> map = new ConcurrentHashMap<>();
     private long overhead;
     private long experimentStart = Long.MAX_VALUE;
-    private final static double NORMALIZATION = Math.pow(10, 6);
+    private static final double NORMALIZATION = Math.pow(10, 6);
 
     /**
      * Start a performance measurement, identified by a tag